What does the syntax look like. We have three FADALs also.

Can a person put an IF-THEN statements in a program. This for a HAAS 3-Axis Vert. Mill. For example, this is what I want to do. Run part of a program M00 Wait for operator input (a "Y" for yes or a "N" for No) If the op type y, the program continues on to the end but if the op types "N" then the program goes back to rerun a certain tool. Is that scenario easy to do & how do I do it

Does anyone know how to do quad-lead threads in Matercam Lathe?